Sheet-metal shears



(No Model.)

J. E. MASON..

SHEET METAL SHEAES. N01.371,961'.1 Patented Oct. 25, 1887.

A :'1 y 1 f www UNITED STATES PATENT OFFICE..

JAMES HEWETT MASON, OE CHICAGO, ASSIGNOE OE ONE-HALE To GEORGE E.WATSON, OE AUEOEA, ILLINOIS.

SHEET-METAL SHEARS.

SPECIFICATION forming pari; of LettersPatent No. 371,961, dated Gotober25, 1887. Application filed March 26, 1887. Serial No. 232541. (Nomodel.)

To @ZZ whom. it may concern..-

Be it known that I, JAMES HEWETT MASON, of Chicago, in the county ofCook and State of Illinois, have invented certain new and usefnlImprovements in Gutters for Sheet Metal, Ste. 5 and I do hereby declarethat the following is a full, clear, and exact description of theinvention, which will enable others skilled in the art to which itappertains to make and use the saine, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specication.

My invention consists in aspecial construction of apparatus, and wherebythe same is not only very strong, but is adapted either for light workor for very heavy work--such as cutting boiler-plate-while it is alsosuitable for ordinary work and for circular work.

In the drawings, Figure 1 illustrates in side elevation one form ofmachine embodying my invention; Fig. 2, an end elevation; Fig. 8, atransverse section in the line w .t of Fig. l; Fig. 4, a detail showinga variation in the carriage.

A represents a cast-iron bed or frame; B B', sprocket wheels mounted,respectively, in strong uprights C C'at each end of this bed or frame;E, an endless sprocket or link chain on these wheels and extending fromone to the other; F, a cuttercarriage secured to this chain andreceiving from it a traveling motion when these wheels are turned byanysuitable means-such asa crank, gear, or Otherwise. On this carriageis journaled and firmly held a rotary cutter, F', which of coursetravels back and forth with the chain .and carriage and over the metalto be out.

G G are friction-rollers on the carriage,and which I ind sometimesdesirable, to receive the upward thrust of the cutter during thetraverse when heavy work is done-such as cutting boiler-iron; but in amachine for general light Work these rollers may be dispensed with, thecarriage then simply running in its guides 7L h, like those for thecross-head of an engine.

I sometimes attach to the carriage F a projecting piece, L, reachingdown nearly to the edge of the rolling cutter F, for the purpose of 5osupporting or holding said cutter close up to the straight stationaryknife, and also for the purpose of taking oft' the strain from the pinor journal on which the cutter F revolves and to relieve and resist thestrain on this cutter when doing heavy work, such as shearingboiler-plate, dto.

M is a friction roller or pulley on 'the inner face of this piece L, andthis piece L may, if desired, be an integral part of the carriage.

I, in Figs. l and 3, represents a stationary shear-blade extendinglengthwise of the machine between the uprights C C', and when only onerotary cutter is used it engages with this stationary blade to effectthe cutting.

Instead of attach-ing the crank K directly to the shaft of one of thesprocket-wheels, as shown, it may, when it is desired to make themachine more powerful in its action, be attached to gearing. By thusbackgearing,77 7o it can do heavier work, such as boilerplate.

My machine as constructed may be driven by hand or power from astationary driver located at either end of the machine.

It will be evident that the machine can ,be used for cutting othermaterial besides metal, and for some kinds of light work a belt could besubstituted for the chain and pulleys for the sprocket-wheels; or thecarriage can be propelled by a shaft and gears.

I claim* 1.. In a machine adapted for cutting sheet metal, thecombination, with the supportingframe, the sprocket-wheels, and thechain or its described equivalent connecting the same, of acutter-carriage attached to Such chain and having journaled thereon arotary cutter, the carriage and its cutter being adapted. to travelforward and back and to engage with another cutter when the machine isin action..

2. In combination with the stationary eutter and with the rollingcutter-carriage F, the downward projection L and its roller M on saidcarriage, for the purposes set forth.

JAMES HEWETT MASON. Witnesses:

GEO. F. WATSON, F. O. DENNELL.

